THE STABILITY OF THE METAL-COMPLEXES OF CYCLIC TETRA-AZA TETRAACETIC ACIDS

被引：114

作者：

CHAVES, S

DELGADO, R

DASILVA, JJRF

机构：

[1] Centro de Química Estrutural, Instituto Superior T'ecnico, Lisbon

来源：

TALANTA | 1992年 / 39卷 / 03期

关键词：

D O I：

10.1016/0039-9140(92)80028-C

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The stability constants of the complexes formed by three tetra-aza macrocyclic complexones (DOTA, TRITA and TETA) with Mn2+, Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+ and Pb2+ were determined with an automated titration instrument with data acquisition and the calculations were performed with the Superquad program, confirming and extending the range of values previously available. Both 1:1 and 2:1 metal-to-ligand complexes were now considered including their protonated species. The results show that DOTA is a powerful but unselective ligand whereas TETA, although not so powerful as DOTA, is an interesting selective ligand for pairs of metal ions, e.g., Cd2+ and Pb2+.

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页码：249 / 254

页数：6

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